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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c48b566eadc136ff53d1e952c5f90df8810df460fa85cc0e79c257cd53afde' 
  AND token = '8h0pmjzY42d16FkS4l9hq+sCotMGmc3llCq/ziMUTXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}